Casting machine



Aug. 14, 1951 E. M. TALLBERG CASTING MACHINE 2 Sheets-Sheet 1 FiledMarch 30, 1948 INVENTOR.

mwwi zm Aug. 14, 1951 E. M. TALLBERG 2,564,615

CASTING MACHINE Filed March 30, 1948 2 Sheets-Sheet 2 INVENTOR. 2 27747Patented Aug. 14, i951 UNITED STATES PATENT OFFICE 2 Claims.

The present invention relates to an improved casting machineconstruction adapted for use in material forming apparatus including diecasting machines, injection molding machines, and the like.

The principal objects of the present invention include the provision ofan improved casting machine which is simple in construction, economicalof manufacture, and reliable and efiicient in operation; to provide animproved casting machine having a fixed machine plate and a travellingmachine plate movable into and out of abutting engagement with the fixedmachine plate, both of which plates are adapted to directly receive dieinsert elements in their abutting faces; to provide an improved castingmachine adapted for simultaneously producing a plurality of cast piecesand having a fixed machine plate and a travelling machine plate movableinto and out of abutting engagement with the fixed machine plate, bothof which plates are built into the machine as permanent parts thereofand are adapted to perform the functions of die plates and therebyeliminate the need for the unit die mounted between the machine platesin conventional casting machine constructions; to provide an improvedcasting machine havin cooperating machine plates recessed to receivecomplementary die insert elements and adapted for movement into abuttingrelation to provide a seal around said elements to prevent escape ofthe.

material being cast, during a casting operation; to provide an improvedcasting machine having an improved ejector mechanism; to provide animproved casting machine having animproved master ejector mechanismpermanently mounted in the travelling machine plate thereof; to provide,for a casting machine, an improved travelling plate adapted to bepermanently built into the machine as a machine plate thereof andrecessed to support a die insert element in flush relation with therecessed face thereof; to provide for a casting machine an improvedtravelling plate adapted to be permanently built into the machine as amachine plate thereof and having a central chamber, a recess in one facethereof adapted to receivea die insert element'and an associated ejectormechanism projecting into the central chamber, and master ejector meansmounted in the central chamber for operating the ejector meansassociated with the die insert element and means extending through theopposite face of the travelling plate for engaging a portion of themachine to actuate the ejector mechanism; and to otherwise improve theconstruction and operation of casting machines.

Other and more detailed objects of the invention will become apparentfrom a consideration of the following specification, the appended claimsand the accompanying drawings where- Figure 1 is a broken view inelevation of a casting machine embodying the invention;

Fig. 2 is an. enlarged view in transverse section of the constructionillustrated in Fig. 1 taken substantially along the line 2-2 thereof;

Fig. 3 is a broken view in section of the construction illustrated inFig. 2 taken substantially along the line 33 thereof; and

Fig. 4 is an enlarged view in section of the ar- I ticle formed by thedie elements illustrated in the foregoing figures.

It will be appreciated from a complete understanding of the presentinvention that the improvements'thereof may be readily embodied inmaterial forming apparatus of various types and constructions, The termcasting machine" is usedherein in a broad sense to include all suchmaterial forming apparatus, including but not limited to die castingmachines and injection molding machines. In an illustrative, but not ina limiting sense, the improvements of the present invention areillustrated and described herein inrelation to a die casting machine.

Referring to the drawings, the casting machine to the travelling plate22 as hereinafter described.

The machine plates 14 and I6 are mounted in parallel relation and areinterconnected at their four corners by four parallel machine bars 28.The machine plates I4 and I6' are rigidly secured to the bars 28 andaccurately positioned relative to each other by means of nuts 30received on threaded portions 32 at the opposite ends of the bars 28.The travelling machine plate 22 is slidably supported 'on the'bars 28which extend through apertures 34 formed in the four corners of thetravelling plate 22 and in which are mounted semi-cylindrical bearingbushings 36;

which engage and slide along the bars 28.

The means for supplying the liquid or moltenmaterial forms no part ofthe present invention and accordingly is not illustrated or describedherein.

The front plate l4, the travelling plate 22 and the back plate l6 arecommonly referred to as machine plates because they are built into themachine as permanent parts thereof. Casting machines of this generalarrangement, including spaced front and back machine plates and atravelling machine plate mounted intermediate the front and back plates,are, of course, well known in the art. The casting machine of thepresent invention differs from such conventional machines in that itstravelling machine plate 22 is adapted for movement into and out ofabutting engagement with its front machine plate l4 and the abuttingfaces of these plates are recessed to directly receive complementary dieinsert elements 38 and 40. This construction permits the use of theimproved automatic ejector mechanism hereinafter described.

Considering the construction of these plates in greater detail, accuratealignment of the front machine plate 14 and the travelling machine plate22, when the latter is moved to the closed position illustrated inFigures 1 and 3 of the drawings in which the adjacent faces of theplates are in abutting engagement, is insured by cooperating conicalsurfaces 42 and 44, formed on the plates l4 and 22 respectively. Theseconical surfaces 42 and 44 are generated about an axis parallel to thebars 28 and extending through the center of the plates l4 and 22. Theseconical surfaces 42 and 44 are preferably disposed at a. maximumpractical distance from the centers of the plates. In the constructionillustrated, they are discontinuous and are at substantially the samedistance from the centers of the plates as are the machine bars 28.

The front plate M, in the preferred construction illustrated in thedrawings, has a centrally disposed sprue 46 and four equally angularlyspaced cylindrical recesses 48 formed in its rear or left-hand face asviewed in Figures 1 and 3 of the drawings. Each of the recesses 48 isadapted to receive a cylindrical die insert element 38 which is securedin place by means of a set screw 50 mounted in the front plate I4 andprojecting laterally'into the recess 48 through the cylindrical wallthereof. The inner end of the screw 50 is received in an annular groove52 formed in the cylindrical wall of the die insert element 38 anddisposed to register with the set screw 50 when the die insert element38 is in assembled position.

The travelling machine plate 22, in its front face or face adjacent thefront plate I4, has four cylindrical recesses 54 disposed to registerwith the recesses 48 in the front plate l4 and adapted to receive thecylindrical die insert elements 40. The front face of the travellingplate 22 is also recessed to define a gate 56 adapted to receive fromthe sprue the liquid or molten material to be cast and distribute thesame to the die cavities 58 defined by the complementary die insertelements 38 and 40.

The travelling machine plate 22 of the present invention also carriesmeans for automatically ejecting the cast pieces and the sprue, duringthe operation of the machine. For this purpose, an individual ejectormeans, generally indicated at 60, and individual to each die insertelement 48 is provided, and a master ejector means, generally indicatedat 62, is provided for actuating the individual ejector means. 60. Eachindividual ejector means 60 includes an individual ejector plate 64 andejector pins 66 rigidly mounted on the plate 64 and adapted to projectthrough the die insert element 40 and into the die cavity 58 formedtherein. It will be appreciated that the ejector means 60 must bedesigned for use with a particular die insert element 40 since thenumber, disposition and length of the ejector pins 66 must necessarilyvary, depending upon the contour of the die cavity 58. The individualejector means 60 is assembled into the travelling machine plate 22 withthe die insert element 40, the ejector pins 66 extending rearwardly fromthe die insert element 40 or to the left as viewed in Figures 1 and 3,and the individual ejector plate 64 projecting into a large centrallydisposed recess 68 formed at the rear of the travelling plate 22.

The master ejector means 62 is disposed within the recess 68 and forms apermanent part of the machine. The master ejector means 62 comprises amaster ejector plate 18 received in the recess 68 and adapted to engagethe individual ejector plates 64 and carrying forwardly projectingejector pins 12 for engaging and ejecting the sprue. The recess 68 isclosed by a large central cover plate 14 secured to the plate 22 by aplurality of screws 16. The cover plate '14 is welded or otherwisesuitably secured at its center to the outer end of the ram 26. Adjacentits periphery, this cover 14 has a plurality of apertures 18 whichslidably receive ejector rods 80. The inner or forward ends of theserods are threaded or otherwise suitably secured to the master ejectorplate 10. The rods 80 extend parallel to the bars 28 and are of a lengthsuch that their rear ends simultaneously engage the back machine plateI6 as the travelling plate 22 approaches the limit of its movement in anopening direction. Upon such engagement of the rods 88 with the backplate 16, it will be appreciated that continued movement of thetravelling plate 22 in a rearwardly direction, or to the left as viewedin Figures 1 and 3, causes the ejector plates 18 and 64, and the ejectorpins 12 and 86 carried thereby, to move relative to the travelling plate22 and the die insert elements 40 carried thereby in a manner to ejectthe cast pieces and the sprue therefrom.

The above-described construction permits the recess 82 in the cast piece84 to be readily formed by a core pin 86 mounted in the plate 14 andprojecting forwardly through the master ejector plate In, the individualejector plate 64, the die insert element 40 and into the die cavity 58.To eject the cast piece 84 from the pin 86, a tubular ejector pin 88 ismounted on the individual ejector plate 64 and surrounds the pin 88. Itwill be appreciated that upon actuation of the ejector means 82 and 68the tubular pin 88 strips the core pin 86 to free the cast piece fromthe core pin and aid in the ejecting of the former from the die cavity.

The die insert elements 38 and 40 are of a thickness equal to the depthof the recesses 48 and 54, respectively, in which they are received,whereby the outer faces of the die elements 38 and 40 are disposed flushwith the recessed faces of the front plate l4 and the travelling plate22. It will thus be appreciated that the abutting faces of the frontplate l4 and the travelling plate 22 have a sealing effect surroundingeach of the complementary pairs of die insert elements 38 and 40,thereby eliminating the necessity of any specific extent of. sealingarea between the complementary die.

elements.

It will now be appreciated the present invention provides a castingmachine which is simple and:

vention has been illustrated and described in detail, it will be readilyappreciated by those skilled in the art that numerous modifications andchanges may be made therein without departing from the spirit of theinvention or from the scope of the appended claims.

What is claimed is:

1. A casting machine comprising a fixed machine plate, a travelingmachine plate mounted for movement into and out of abutting engagementwith said fixed machine plate, and means for efiecting said movement ofsaid traveling machine plate, said plates having cooperating facesadapted to move into abutting engagement and recessed; to mountcomplementary die insert elements in said abutting faces, and saidplates having cooperating conical guide surfaces on said faces adaptedto interengage as said plates are moved into said abutting engagement toinsure proper alignment of said plates.

2. A casting machine comprising a fixed machine plate, a travelingmachine plate mounted for movement into and out of abutting engagementwith said fixed machine plate, and means for effecting said movement ofsaid traveling machine plate, said plates having cooperating facesadapted to move into abutting engagement and recessed; to mountcomplementary die insert elements in said abutting faces, and saidplates having cooperating conical guide sufaces on said faces disposedoutwardly of said complementary die insert elements adapted tointerengage as said plates are moved into said abutting engagement toinsure proper alignment of said plates.

EINAR MARTIN TALLBERG.

REFERENCES CITED The following references are of record in th file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,909,253 Claus May 16, 19332,111,857 Jeifery Mar. 22,1938 2,191,882 Ernst et a1. Feb; 27, 19402,204,151 Rodefer et al June 11, 1940 2,298,044 Dinzl Oct. 6, 19422,332,856 Kalajian Oct. 26, 1943

